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25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
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25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
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25 East 21st Street, DUPLEX23

Flatiron District | NY
Broadway & Park Avenue South

Schedule a Viewing
$ 8,800,000
Active
Status
16
Rooms
7
Bedrooms
8.5
Bathrooms
7,000/650
ASF/ASM
$ 5,758
Real Estate Taxes [Monthly]
$ 7,362
Common Charges [Monthly]
90%
Financing Allowed
  • 25 East 21st Street, DUPLEX23
  • 16 Rooms
  • 7 Beds
  • 8.5 Baths
  • $ 8,800,000

Photos

25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010

Floor Plans

25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010

Description

The combination of the 2nd and 3rd floors to create a sprawling 7,000 sq. ft. duplex—one of the largest Flatiron condo lofts available. Each floor boasts an expansive open layout measuring over 40 feet wide and 82 feet deep, with soaring ceilings ranging from 12.5 to 13.5 feet. This extraordinary space offers the opportunity to design a duplex of epic proportions. Imagine crafting a spacious 7-bedroom home with 7-8 bathrooms, generous entertaining areas, a media room, library, home office, gym, spa, ample storage, staff rooms, and more. The south-facing, oversized windows flood the space with brilliant natural light throughout the day. The current floor plans (both floors feature identical layouts) showcase a versatile blank canvas, and a proposed 7-bedroom configuration is also available for inspiration. With only two small columns on each floor, the possibilities for customization are virtually limitless. This exclusive boutique condo building comprises just 11 full-floor residences and features a doorman for added convenience. The seamless conversion from commercial to residential use provides the freedom to develop your vision. Nestled on a peaceful, picturesque block in the heart of Flatiron, this offering is a rare gem—a unique opportunity to craft an exceptional living space tailored to your style and imagination.
The combination of the 2nd and 3rd floors to create a sprawling 7,000 sq. ft. duplex—one of the largest Flatiron condo lofts available. Each floor boasts an expansive open layout measuring over 40 feet wide and 82 feet deep, with soaring ceilings ranging from 12.5 to 13.5 feet. This extraordinary space offers the opportunity to design a duplex of epic proportions. Imagine crafting a spacious 7-bedroom home with 7-8 bathrooms, generous entertaining areas, a media room, library, home office, gym, spa, ample storage, staff rooms, and more. The south-facing, oversized windows flood the space with brilliant natural light throughout the day. The current floor plans (both floors feature identical layouts) showcase a versatile blank canvas, and a proposed 7-bedroom configuration is also available for inspiration. With only two small columns on each floor, the possibilities for customization are virtually limitless. This exclusive boutique condo building comprises just 11 full-floor residences and features a doorman for added convenience. The seamless conversion from commercial to residential use provides the freedom to develop your vision. Nestled on a peaceful, picturesque block in the heart of Flatiron, this offering is a rare gem—a unique opportunity to craft an exceptional living space tailored to your style and imagination.

Listing Courtesy of Compass

Features

A/C [Central]

View / Exposure

North, South Exposures
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010

Building Details

25 East 21st Street DUPLEX23 Flatiron District New York NY 10010
New Development
 
Condo
Ownership
Loft
Building Type
Concierge
Service Level
Elevator
Access
Pets Allowed
Pet Policy
850/7501
Block/Lot
Pre-War
Age
1904
Year Built
11/11
Floors/Apts
25 East 21st Street DUPLEX23 Flatiron District New York NY 10010

Contact

License Licensed As: Jay M. Heydt
Jay Heydt

Jay Heydt

License Licensed As: Jay M. Heydt

Principal Broker

W: 646-234-5815
M: 646-234-5815
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This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2025 REBNY Listing Service, Inc. All rights reserved. All information is intended only for the Registrant’s personal, non-commercial use. RLS Data display by Vertical Real Estate. Additional building data provided by On-Line Residential [OLR].
All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer.
Listing ID: 2052159